riscv: enable sys_clone3 syscall for rv64

Enable the sys_clone3 syscall for RV64.  We simply include the generic
version.

Tested by running the program from

   https://lore.kernel.org/lkml/[email protected]/

and verifying that it completes successfully.

Signed-off-by: Paul Walmsley <[email protected]>
Acked-by: Christian Brauner <[email protected]>
Cc: Christian Brauner <[email protected]>

Author: paul-walmsley-sifive

arch/riscv/include/uapi/asm/unistd.h

@@ -18,6 +18,7 @@
 #ifdef __LP64__
 #define __ARCH_WANT_NEW_STAT
 #define __ARCH_WANT_SET_GET_RLIMIT
+#define __ARCH_WANT_SYS_CLONE3
 #endif /* __LP64__ */
 
 #include <asm-generic/unistd.h>